CN202171657U - Novel triplexer for passive optical network - Google Patents
Novel triplexer for passive optical network Download PDFInfo
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- CN202171657U CN202171657U CN2011202622735U CN201120262273U CN202171657U CN 202171657 U CN202171657 U CN 202171657U CN 2011202622735 U CN2011202622735 U CN 2011202622735U CN 201120262273 U CN201120262273 U CN 201120262273U CN 202171657 U CN202171657 U CN 202171657U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 15
- 230000008878 coupling Effects 0.000 claims description 54
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- 238000005859 coupling reaction Methods 0.000 claims description 54
- 239000000835 fiber Substances 0.000 claims description 27
- 238000012545 processing Methods 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000013307 optical fiber Substances 0.000 description 3
- 229920000620 organic polymer Polymers 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 239000012792 core layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
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Abstract
A novel triplexer for a passive optical network comprises an input waveguide for inputting a 1490nm/1550nm optical signal, a first output waveguide for emitting a 1490nm signal, a second output waveguide for emitting a 1550nm signal, and an upload waveguide for uploading a 1310nm signal. The triplexer also comprises four cascade index type MMI couplers I, II, III and IV, the input waveguide is connected with the input side of the index type MMI coupler I, the output side of the index type MMI coupler I is respectively connected with the input sides of the upload waveguide and the index type MMI coupler II, the output side of the index type MMI coupler II is connected with the input side of the index type MMI coupler III, the output side of the index type MMI coupler III is connected with the input sides of the first output waveguide and the index type MMI coupler IV, and the output side of the index type MMI coupler IV is connected with the second output waveguide. The triplexer has a lowered processing cost, a low transmission loss, and a compact structure.
Description
Technical field
The utility model belongs to the Optical Access Network field, is the single-fiber three-way multiplexer (Triplexer) that is used for EPON (PON), is a kind of single-fiber three-way multiplexer based on plane light wave waveguide technology (PLC, Planar Lightwave Circuit).
Background technology
Along with Optical Access Network network Progress in technique; And the increase of portfolios such as IPTV, video request program and online game; The user further increases the demand of access bandwidth, to the Optical Access Network network require increasingly highly, Fiber to the home (FTTH) has become the main technical schemes of Optical Access Network network; And EPON (PON) technology is the mainstream technology of FTTH, and it can realize video, voice, data unification of three nets.Be used for the PON technology of FTTH; Realize that the core devices of communicating by letter between optical line terminal (OLT) and the terminal user is a single-fiber three-way multiplexer; Developing the single-fiber three-way multiplexer that satisfies communication bandwidth requirement, low cost, low-loss, compact conformation, can manufacture is the actual demand of application, has very important significance.And these actual requirements also are one of key factors of restriction FTTH technology popularization.
The major function of single-fiber three-way multiplexer; Be voice signal 1490nm and vision signal 1550nm with OLT output; And the wavelength 1310nm signal multiplexing that the user uploads advances an optical fiber; The user can send 1310nm through transmitter through receiver difference received speech signal 1490nm and vision signal 1550nm.The single-fiber three-way multiplexer that is based on the discrete device technology of practical application at present is not easy to encapsulation, shortcomings such as coupling loss is big, cost is high, enormous size; And, but can overcome above-mentioned shortcoming well based on the single-fiber three-way multiplexer of plane light wave waveguide technology (PLC), existing research focuses mostly in based on multiple-mode interfence (MMI) coupling mechanism with based on two big types of array waveguide gratings (AWG).Wherein the MMI coupling mechanism has again that polarization loss is low, processing advantages such as tolerance is big.With the immediate prior art of the utility model is to adopt the single-fiber three-way multiplexer of the MMI coupling mechanism composition of two cascades, referring to accompanying drawing 1, and adopts based on extra length (the Jong-Kyun Hong that reduces device from the phenomenon that forms images under the weak sliver spare; Sang-Sun Lee, PLC-based novel triplexer with a simple structure for optical transceiver module application, IEEE Photonics Technology Letters; Vol.26, No.1, pp21-23; 2008), however in this structure, the output arm of MMI coupling mechanism, the straight-through arm of input and input coupling arm are the waveguide of band bending section; And the length of curved waveguide is big; Processing cost is high, and loss is high, and what this in addition single-fiber three-way multiplexer based on the MMI coupling mechanism adopted is traditional (rectangle) MMI coupling mechanism; Do not break this relation that square is directly proportional in MMI coupler length and broadband, can't let size of devices accomplish enough compactnesses.
Summary of the invention
In order to overcome existing having now in the deficiency that processing cost is high, loss is higher, structure is not compact of the single-fiber three-way multiplexer of MMI coupling mechanism, the utility model provides a kind of and cuts down finished cost, loss is lower, the novel single-fiber three-way multiplexer that is used for EPON of compact conformation.
The utility model solves the technical scheme that its technical matters adopted:
A kind of novel single-fiber three-way multiplexer that is used for EPON; The input waveguide that comprises input optical signal 1490nm/1550nm; Second output waveguide of first output waveguide of emission 1490nm, emission 1550nm and the waveguide of uploading of uploading 1310nm; Said novel single-fiber three-way multiplexer also comprises exponential type MMI coupling mechanism I, II, III, the IV of four cascades; Said input waveguide is connected with the input side of said exponential type MMI coupling mechanism I; The outgoing side of said exponential type MMI coupling mechanism I is connected with the said input side of uploading waveguide, exponential type MMI coupling mechanism II respectively; The outgoing side of said exponential type MMI coupling mechanism II is connected with the input side of exponential type MMI coupling mechanism III, and the outgoing side of said exponential type MMI coupling mechanism III is connected with the input side of first output waveguide, exponential type MMI coupling mechanism IV respectively, and the outgoing side of said exponential type MMI coupling mechanism IV is connected with second output waveguide.
As preferred a kind of scheme, said input waveguide, first output waveguide, second output waveguide and upload waveguide and all adopt and bury the type organic polymer waveguide.
Further again, the parameter of said each waveguide is: the sandwich layer refractive index n
r=1.51, cladding index n
c=1.46, duct thickness is 4 μ m; Said input waveguide, first output waveguide and the second output waveguide width are 4 μ m; The input side width of said exponential type MMI coupling mechanism I is that 15 μ m, outgoing side width are 18 μ m; The input side width of said exponential type MMI coupling mechanism II is that 12 μ m, outgoing side width are 9 μ m; The input side width of said exponential type MMI coupling mechanism III is that 21 μ m, outgoing side width are 24 μ m; The input side width 15 μ m of said exponential type MMI coupling mechanism IV, outgoing side width are 12 μ m, and the core layer thickness of whole single-fiber three-way multiplexer is that 4 μ m, overall width are that 30 μ m, length are 5756 μ m.
The beneficial effect of the utility model mainly shows: 1, adopt the cascade of exponential type MMI coupling mechanism to form; Exponential type MMI coupling mechanism can be when guaranteeing image quality; Break this relation that square is directly proportional of device length and width, shortened the size of single-fiber three-way multiplexer significantly.2, adopt new design concept, this single-fiber three-way multiplexer is compared and is adopted the stacking image characteristic in the past based on the general interference imaging characteristic of MMI coupling mechanism, has simplicity of design, inserts low, the isolation advantages of higher of loss.3, the easy machine-shaping of adopting of organic polymer waveguide, need not complicated technology.
Description of drawings
Fig. 1 is the single-fiber three-way multiplexer structural representation of prior art.
To be that the utility model is a kind of be used for fiber-to-the-home novel planar optical-waveguide-type single-fiber three-way multiplexer structural representation to Fig. 2.
Fig. 3 is a single-fiber three-way multiplexer monitoring module scheme synoptic diagram.
Fig. 4 is a single-fiber three-way multiplexer at input wavelength is 1200nm during to 1600nm, the synoptic diagram of the normalization output power of each output terminal.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described.
With reference to Fig. 1～Fig. 4; A kind ofly be used for fiber-to-the-home planar type optical waveguide single-fiber three-way multiplexer; The input waveguide 1 that comprises input optical signal 1490nm/1550nm, is uploaded the exponential type MMI coupling mechanism I, II, III, the IV that upload waveguide 4 and four cascades of 1310nm at second output waveguide 3 of first output waveguide 2 of emission 1490nm, emission 1550nm.Said input waveguide 1 is connected with the input side of said exponential type MMI coupling mechanism I; The outgoing side of said exponential type MMI coupling mechanism I is connected with the said input side of uploading waveguide 4, exponential type MMI coupling mechanism II respectively; The outgoing side of said exponential type MMI coupling mechanism II is connected with the input side of exponential type MMI coupling mechanism III; The outgoing side of said exponential type MMI coupling mechanism III is connected with the input side of first output waveguide 2, exponential type MMI coupling mechanism IV respectively, and the outgoing side of said exponential type MMI coupling mechanism IV is connected with second output waveguide 3.
As shown in Figure 3, input waveguide 1 is connected to automatic detection module through beam splitter A1 by PIN detector A2 on one side, and another side links to each other with exponential type MMI coupling mechanism I; First output waveguide 2 is connected to automatic detection module through beam splitter C1 by PIN detector C 2 on one side, and another side links to each other with exponential type MMI coupling mechanism III; Optical fiber is connected to PIN detector B2 through beam splitter B1 and is connected to automatic detection module, and another side links to each other with exponential type MMI coupling mechanism IV; The waveguide 4 of uploading of uploading 1310nm is connected to automatic detection module through beam splitter D1 connection PIN detector D2, and another side is connected on the exponential type MMI coupling mechanism I.From input waveguide 1 by left-to-right be respectively exponential type MMI coupling mechanism I, II, III, IV.
1310nm is the signal that the user uploads, and 1550nm is a vision signal, and 1490nm is a voice signal.1310nm uploads through exponential type MMI coupling mechanism I and is coupled into input waveguide 1 through uploading waveguide 4; 1490nm is exported by first output waveguide 2 through exponential type MMI coupling mechanism I, II, III through input waveguide 1, and 1550 pass through input waveguide 1 process exponential type MMI coupling mechanism I, II, III, IV by 3 outputs of second output waveguide.
Single-fiber three-way multiplexer has also added can obtain each light signal respectively in the luminous power of input end and the luminous power of output terminal, and real-time monitor optical signal normal monitoring module whether at this point.Monitoring module is through beam splitter A1, B1, and C1, D1 obtain optical waveguide 1,3 respectively, 2,4 sample light, again through PIN detector A2, B2, C2, D2 is input to monitoring module with the parameters such as luminous power of each optical fiber, comes whether operate as normal of recognition means.
The utility model device takes to bury the type organic polymer waveguide, the sandwich layer refractive index n
r=1.51, cladding index n
c=1.46, all duct height 4 μ m, input waveguide, first output waveguide and the second output waveguide width, 4 μ m; Exponential type MMI coupling mechanism width from left to right is: 15 μ m, 18 μ m, 12 μ m, 9 μ m, 21 μ m, 24 μ m, 15 μ m, 12 μ m; The entire device core layer thickness is that 4 μ m, overall width are that 30 μ m, length are 5756 μ m, and exponential type MMI coupling mechanism I, II, III, IV length are respectively 1391 μ m, 960 μ m; 2285 μ m, 1120 μ m.
Referring to accompanying drawing 4; Adopt bundle transmission method (BPM) that the light wave of the utility model device from 1200nm to 1600nm scanned; Normalization output power by each output waveguide distributes and can know: centre wavelength is that the three dB bandwidth of 1310nm, 1490nm and 1550nm wavelength is respectively 112.39nm, 29.44nm, 26.7nm; Meet ITU-T bandwidth requirement G.984.4; Operation wavelength is that the insertion loss of 1310nm, 1490nm, 1550nm is respectively 0.34dB, 0.9dB, 1.17dB, and each wavelength of different passages isolation each other is between 12.74dB and 37.15dB.These performances all are superior to the single-fiber three-way multiplexer based on the MMI coupling mechanism in the past.
The described content of this instructions embodiment only is enumerating the way of realization of utility model design; The protection domain of the utility model should not be regarded as and only limit to the concrete form that embodiment states, the protection domain of the utility model also reach in those skilled in the art according to the utility model design the equivalent technologies means that can expect.
Claims (1)
1. novel single-fiber three-way multiplexer that is used for EPON; The input waveguide that comprises input optical signal 1490nm/1550nm; Second output waveguide of first output waveguide of emission 1490nm, emission 1550nm and the waveguide of uploading of uploading 1310nm; It is characterized in that: said novel single-fiber three-way multiplexer also comprises exponential type MMI coupling mechanism I, II, III, the IV of four cascades; Said input waveguide is connected with the input side of said exponential type MMI coupling mechanism I; The outgoing side of said exponential type MMI coupling mechanism I is connected with the said input side of uploading waveguide, exponential type MMI coupling mechanism II respectively; The outgoing side of said exponential type MMI coupling mechanism II is connected with the input side of exponential type MMI coupling mechanism III, and the outgoing side of said exponential type MMI coupling mechanism III is connected with the input side of first output waveguide, exponential type MMI coupling mechanism IV respectively, and the outgoing side of said exponential type MMI coupling mechanism IV is connected with second output waveguide.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202622735U CN202171657U (en) | 2011-07-22 | 2011-07-22 | Novel triplexer for passive optical network |
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| CN2011202622735U CN202171657U (en) | 2011-07-22 | 2011-07-22 | Novel triplexer for passive optical network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279441A (en) * | 2011-07-22 | 2011-12-14 | 浙江工业大学 | Novel single-fiber triplexer for passive optical network |
| CN104007513A (en) * | 2014-05-08 | 2014-08-27 | 北京大学 | Light polarization beam splitter |
-
2011
- 2011-07-22 CN CN2011202622735U patent/CN202171657U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279441A (en) * | 2011-07-22 | 2011-12-14 | 浙江工业大学 | Novel single-fiber triplexer for passive optical network |
| CN102279441B (en) * | 2011-07-22 | 2013-03-27 | 浙江工业大学 | Novel single-fiber triplexer for passive optical network |
| CN104007513A (en) * | 2014-05-08 | 2014-08-27 | 北京大学 | Light polarization beam splitter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120321 Termination date: 20140722 |
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| EXPY | Termination of patent right or utility model |